OTC Bulletin Board - Question

A colleague of mine has bought shares in a company which recently listed on the OTCBB market (securities market in the US) The shares were issued at a discount at the time of listing - 80c per share; they are now priced at $3.04, but the volume of trading always seems to be nil and he's been advised that the stock is iliquid. There is a restrictive legend on the shares, which stops any sale before end of August. He has become increasingly concerned about the firm who introduced the stock (they cold called him originally, are on an FSA warning list and have a very agressive style - won't leave him alone. He is now concerned that he will struggle to sell the shares when the restictive legend ends. Any comments / advice grately received.